Sanctions will prevent the country's currency from circulating in the international market. Holders will sell a lot of gold or dollars (or RMB (* _ *)) to preserve their value. What do you think will happen if there is more money? Depreciation, of course. However, there should be very few investors holding Iranian currency, and it is expected that as long as there is no war, it should not depreciate too much. Also, don't forget that China has money but no oil, and Iran has oil! For Iran, selling oil to China is a good opportunity to make money, which is of great help to preserve the value of the currency.